Power transmitter



A. H. DE VOE.

POWER TRANSMITTER.

APPLICATION FILED APR.1 191a.

T- J H d W AW 4 My l a \J P n q l bu A. H. DE VOE. POWER TRANSMITTER.

APPLICATION FILED APR. 1, I918. 1,401,967; Patented Jan. 3,1922.

4 SHEETS-SHEET 2.

- A. H. DE VOE.

POWER TRANSMITTER.

APPLICATION FILED APR. I 1918.

Patented Jan. 3, 1922;

4 SHEETS-SHEET 3.

IAOLQGK wm/ron mIfiw/m Br I 1 I, I ATTORNEY @Dzgijerz- A. H. DE VOE.

POWER TRANSMITTER.

' APPLICATION FILED APR. 1, ms.

Patented Jan. 3, 1922, 4 SHEETS-SHEET 4.

INVENTOH I WP MM the sewing machine.

area.

ALBERT H. DE VOE, OF WESTFIELD, NEW JERSEY, ASSIGNOR TO THE SINGER, MANU- FACTURING COMPANY, A CORPORATION OF NEW J LMPLQQT.

' Application filed April 1',

To all whom it may concern. I

Be it known that I, ALBERT H. DE Von,.a citizen of the United States, residing at Westfield, in the county of Union and State of New Jersey, haveinvented certain new and useful Improvements in Power Transmitters, of which the following is a specification, reference being. had therein to the accompanying drawings. This invention relates to power-transmitting devices of the friction clutch-and-brake type represented in my Patent No. 1,163,980, of December 14, 1915, and .intended primarily for use in connection with powerdriven sewing machines.

Sewing machines, as used in garment factories, are commonly supported in rows upon long power-tables beneath which suitable line-shafting extends; a series of treadlecontrolled powentransmitters being sus pended from the under sides of the tables and belted up to the line-shafting and to the sewingmachines which they are intended to control. As is well known, these powertransmitters usually include a constantly running or driving member, which is belted to the line-shaft, and an intermittently running 0rdrive-n member which is belted to The operator, by depressing a'treadle, effects a frictional engagement of the driving and driven-members, thereby starting the machine. When the pressure upon the treadle is removed the drivi connection is broken and the machine is brought to rest.

The present invention has for an object to provide an improvedpower-transmitter having quick starting and stopping charac I teristics particularly useful in connection with the control, of high-speed sewing machines.

' Another object of the invention is to construct a compact and efiicient power-transmitter in which-frictional losses are reduced to a minimum. 7

Still further, the invention has for an obj'ect to provide a power-transmitter which will run for long periods of time without attention on the part of the operator.

Further objects of the device will appear from the following description and claims.

The present power-transmitter,in its preferred embodiment, comprises a constantly running or driving pulley and a fixed brakedisk between which is journaled .a driven Specification of Letters Patent.

POWER TRANSMITTER.

Patented Jan. 3 i922. 1918. Serial No. 225,935. I

I pulley, the latter being shiftable axially into engagement with either the driving pulley or brake-disk to start or stop the machine belted thereto. The driven pulley is fixed to a stub-shaft which is journaled within a tubular stud upon which the driving pulley is journaled in fixed running posit1o n. A pair of cam-faced arms control a pan of thrust-pins arranged at opposite ends of the shaft carrying the driven pulley to shift said shaft endw' ise; said cam-armsbemg so constructed and arran ed that one of them recedes-just sufficient y to accommodate the movement of its follower thrustpin occasioned by the other cam-faced arm at the opposite side of the driven pulley. The two cam-arms thus act in a positive manner to control the position of the driven member between the driving and brake members.

The transmitter proper is adjustably supported from a suitable bracket by means of a pair of parallel slide-rods one of which is fixed to the bracket and the other and longer of which is slidablysupported by the bracket and passes through an aperture in the transmitter frame or hanger. The longer slide-pin is formed with a screwthread which is engaged by a follower-pin I fixed to the transmitter frame. A cam-lever .is pivoted to one end of the longer slide-pin 'the belt may be-quickly restored by resetting the cam-lever without altering the adjustment of the slide-pin relatively to the transmitter-frame.

The transmitter-frame is provided with an oil-well from which the lubricant is carried by an oil-ring to a series of radial holes passing through the hub of the driving pulley. The oil then flows along the external bearing in an oil-channel at the upper side of the tubular stud and passes downwardly through oil-holes to lubricate the internal bearing between the tubular shaft and the solid stub-shaft carrying the driven pulley. The oil then flows downwardly from the internal bearing through an inclined port to a ball-thrust bearing which sustains the endthrust of the driven member whenit is modification is mounted.

forcibly-pressed into engagement with the driving member to start the machine. From the ball-bearing the oil flows back into the oiLwell. I

The invention includes other constructive features to" be hereinafter described and pointed out in the appended claims.

In the accompanying drawings Figs. 1 and 2 are left and right side elevations, respectively, of, the improved power-transmitter. Fig. 3 is a front view of the device, partly in section. Fig. 4 is a bottom plan view with the pulleys removed and one arm of the transmitter frame broken away. Fig. 5 is a view showing on a smallscale the treadle-mechanism for controlling the operation of the transmitter. Fig. 6 is a front View partly in section, of a modified form of the invention. Fig. 7 is a right-side elevation of the same and Figs. 8 and 9 are details showing how the dress-guard of'the In the embodiment of the invention chosen for illustration in Figs. 1 to 5, inclu- 25 sive, 1 represents a table-top or other suit able support to which is secured the bracket 2 formed at one side with a lug 3 in which rounding the threaded portion of the slide,

rod 6 and with a laterally projecting lug 12 formed with a channel-way l3 embracing the supportin rod 4. By virtue of this construction t e yoke 8 may be shifted bodily relatively to the bracket 2 along the parallel rods d and 6.

Projecting through the wall of the boss 11 into engagement with the screw-thread 7 is the inner end of a follower-screw 1d, threaded into the boss 11 and accessible through the aperture 15, Fig. 2, in the yoke 8. Pivoted'within the bifurcated extremity of the slide-rod 6 upon the screw-pin 16 is a cam-lever 17 adapted to be used as a handle to turn the slide-rod 6 and effect a relative ad'ustment between said slide-rod and the yo e 8. The cam-lever 17 is flattened at 19 1n the higher portionof its operative edge 18 for a purpose to be described.

The driving pulley 19 of the transmitter,

which is connected by meansof a belt 20,

with the usual constantly running lineshaft, not shown, is formed with a tubular hub 21 which is journaled externally of a tubular stud-pin 22 free at one end and at its opposite end fixed within the bushing 23 which is secured within the apertured lower meme? extremity of the yoke-am 9. The-hub 21 of the constantly running driving pulley is confined to turn in a fixed operative position 22 and a series of ballsbetween said surfaces. I

Mounted in spaced relation with the driving pulley 19 is a friction ring or'brake disk 27 having a peripheral groove 28 within which is secured a leather friction ring 29 of large diameter; the disk 27 beingformed with a hub 30 which is fixed within the apertured lower extremity of the yoke-arm 10.

The driven pulley 31, which in practice is belted to the machine to be driven, is

fixed to a stub-shaft 32 journaled internally of the tubular stud 22 and carries a leather friction ring 33 complementary. to the drivingsurface 26. The driven pulley Blis also formed with a friction shrface 3 f complementary to the similar surface on the brakering 29. Disposed in end-'to-end relation with the stub-shaft 32 are the push-pins 351, 35 which serve to shift the driven pulley into] engagement with either the driving pulley orbrake disk.

lln transmitters of the present type it is customary to provide treadle-controlled mechanism for establishing an interrupted driving relation between the driving .and

driven pulleys. lln the present instance, the

treadle mechanism is of an improved form and comprises-a rock-shaft 36"journaled in the bearing-lugs l2 and 37 on" the hanger- 7 frame 8 andsupporting the downwardly extending arms '88, 38' formed at their lower extremities with cam;surfaces 39, 39 which are substantially parallel with each other but are inclined to the axial line of the stubshaft 32 as shown in Figs. 3 and d.

Formed integrally with the cam-arm 38 is a treadle-arm d0, the two forming a bellcrank-lever. The arm 40 has an apertured end dl to which the usual treadle-rod 41 leading to the treadle-plate i1" is attached. A downward pull upon the treadle-amn d0 will roclt the shaft 36 and cause the cammower aiiordsa convenient means for securing either a light or heavy treadle action as desired. This adjustment can be made with ease by any ordinary sewin machine oper-v ator, whereas with many prlor transmitters it has been necessary for the operator to call in the services of a special machinist to effeet the desired adjustment. It will of course be readily understood that the operator may efiect the stopping of the machine independentlyjof the action of the spring 42 by pressing downwardl upon the forward edge of the treadle-p ate, thus thrusting the treadle-rod' upwardly and forcibly lifting the treadle-arm 40 of the transmitter.

A dress-guard 47 is pivoted to the ear 48 on the yoke 8 and may be swung upwardly to afford access to the driving and driven pulleys. The leaf-spring 49 secured to the guard 47 and bearing against the ointed portion 50 of the ear 48 serves to yie dingly detain the guard 47 in lowered or raised position.'

The oiling system comprises an oil-well 51 in the extremity of the hanger-arm 9 from which the lubricant iscarried by an oil-' ring 52 to a series of radial apertures'53 1n the hub 21 of the driving pulley 19. The oil flows along the'external bearing through the groove 54 in the upper side of the tubular stud 22. From the external bearing the oil passes downwardly through the oil-hole 55 to the internal bearing in the stud 22.

From this bearing the oil flows through the downwardly inclined port 56 to the ballthrust bearing 25 and then returns to the oil-well. By this simple arrangement the various bearin of the. device are plentifully sup-plied with lubricant which passes in series from bearing to bearing wlthout attention from the operator. It will be observed that the cam-lever 17 may be swung from full to dotted line position, Fig. 2, to quickly loosen the belt 20 when the machine is not to be used for a time. When operations are to be resumed the cam-lever is restored to full line position, thus restoring the original degree of belt-tension previously determined by the adjustment of the yoke 8 on the rod 6. The set-screw l l'may, of course, be set up to lock the slide-rod 6 and yoke 8 in their adjusted positions relative to each other. y

In the modification of the invention illustrated in Figs. 6 to 9 inclusive, the various constructive features which are substantially the same as those of the first men-' not be againreferred to. In the modification the brake-disk 27" is formed with an.

upwardly extendi'nglug 57 which is fixed to a lateral pin 58 projecting .from the hanger 8' corres onding to the yoke 8 of the modification rst described The brakedisk 27 is formed with a strengthening rib 59 and with an arcuate slot 60 to afi'ord clearance for-the cam-faced lever 38 which in this modification acts on the ball 35 held within a socket at the right hand end of the stub-shaft 32, Fi 6. i

The dress-guar g of the modification is constructed to swin outwardly horizontally instead of upward y and isform'ed with a pairof lateral cars 61 which are apertured to fit the vertical hinge-pin 62 fixed within the apertured lug63 on the hanger-arm.8' The lower ear 61 is recessed at 64 to rest upon the horizontally bent lower extremity 65 of the hinge-pin 62 to lock the dressguard in closed position. By lifting the dress-guard slightl it may be swun to open position to a 0rd access to the riving pulleys. The various other constructive features of the modification are sub stantially the same as those illustrated in Figs. 1 to 5 inclusive.

t will be observed that by the present arrangement the upwardly extending belt leading from the driven pulley to the sewsewing heads: or for making repairs thereto. The present device, b virtue/of the use of g machine can be readily slipped over, the end of the transmitter for changing the a'tubular stub-shaft, is well adapted torei sist bending strains caused by belt-tension.

The feature-permitting quick loosening and tightening of the belt, wlthout afi'ecting the a justment determining sion on the belt when tightened, is of great practical importance in a device of the present character, as it is well known that the life of leather belting may be materially lengthened b relieving it of tension when not in use.

Having thus set forth the nature of the invention, what I claim herein is- 1. In a power-transmitter, a tubular supporting stud, driving and. driven pulleys, one of said pulleys being journaled on the en, for any reason, the ma. chme is to remain ldle fora t1me, a quickthe degree of tenexterior and the other in the interior of said stud, and duplex cam means -cooperating I with one ofsaid pulleys at each side and the exterior of said stud, a driven pulley,

a shaft carrying said driven pulley and journaled internally of said stud, and means including a pair of cam-faced levers disposed at opposite ends of said shaft for shifting the latter endwise to establish and interrupt driving relation between said pulleys. I

3. In a power-transmitter, a, tubular supporting stud, a driving pulley journaled on the exterior of said stud, a driven-pulley, 2d

a shaft carrying said driven pulley and journaled internally of said stud, a treadlecontrolled arm, and means including a pair of cam-faced levers disposed at opposite ends of said shaft for shifting the latter endwise to establish and interrupt driving relation between said pulleys, said cam-faced levers being rigidly connected together and to said treadle-controlled arm.

4. In a ower transmitter, a hanger having depen ing arms, a driving pulley carried by one arm and a brake-disk carried by the other arm, said pulley and disk having annular friction surfaces in spaced parallel relation, a driven pulley having a stubshaft journaled independently and concentrically of the driving p ulley, said driven pulley having friction surfaces complementary to those of said pulley and disk, reciprocable members carried by said arms in engagement with said stub-shaft, and cam means for actuating said members.

5. in a power-transmitter, an apertured hanger arm, a tubular stnd'free at one end and at its opposite end fixed within the aperture of said hanger-arm, a driving pulley journaled on the exterior of said stud, a stub shaft journaled internally of said stud, a driven pulley rigidly secured to said shaft at the free end of said stud, and manually controlled means cooperating. with opposite ends of said shaft for shifting the same endwise.

6. In a power-transmitting devioe,'in comloination,v a hanger, a tubular bearing stud carried thereby, a driving pulley journ'aled on the exterior of said stud, a stub-shaft journaled on 'the interior of said stud, a

' driven pulley: fixed to said stub-shaft, a

a'hanger, a tubular stud carried by said hanger, a driving pulley formed with a hub raoree'r journaled on said stud, a collar andbalL, i

thrust bearing on said stud at opposite ends of said hub, said ball-thrust bearing including thrust walls disposed in parallel planes transverse to the axis of said stud, and a driven pulley having a stub shaft, journaled in rnally of said stud and adapted to be pressed into engagement with said driving pulley. 8. In a power-transmitter, driving and driven pulleys, and means located at one side of one pulley and the opposite side of the other pulley for relatively shifting them into or'out of operative relation, means for connecting said shifting means whereby they may be simultaneously operated, and means for operating said connecting means. 9. In a power-transmitter, driving and driven pulleys having telescopic shafts, and

. positive means operatively connected to opposite ends of one of said shafts for shift 1ng one of the pulleys toward or from the other, whereby said pulleys are moved into or out of engagement.

10. In a power-transmitter, a driving pulley having a fixed bearing, a driven pulley having a shaft telescopically mounted in said bearing, and means movable transversely to said shaft and coactin with each end there of for shiftin the sha t toward'or from said bearing, to t ereby bring said pulleys into or out of engagement.

. 11. In a power-transmitter, drivingand driven pulleys, one of said pulleys being shiftable into and out of frictlonal en agement with the other, oppositely inc'ined.

cams arranged on opposite sides of the shiftable pulley, means connecting said cams constantly maintaining them in operative-relation to the shiftable pulley,'and means for moving said cams to thereby shift said pulley.-

2; in a power-transmitter, frictionally if engageable driving and driven pulleys, oppositely inclined spaced apart cams, means actuated bysaid cams for engaging said pulleys or.separating them, and meansfor connecting and moving said cams.

13. A power-transmitter comprising driving and driven pul'leysg and a brake-disk, means located at'opposite sides of the transmitter for shifting said driven pulley intoengagement with either the drivingpulley or the brake-disk and meansforpositively.

operating saidshifting means.

14.14). ower-transmitter comprising dr1ving and riven pulleys and a brake-disk, and

means located at opposite sides of the trans mitter and movable transversely to the axis of 'said pulleys for shifting said driven pulley into engagement with either the driving pulley or the brake-disk. Y

15. In a power-transmitter, a

driving I pulley having a'fixed 'tlibular bearing 'a' brake-disk, a drivenpulley interposed between the two and having a shaft slidable within said beari g, and opposed cammeans for positively shifting said shaft and its pulley toward either the driving pulley or the brake-disk.

16. A power-transmitter comprising a driving pulley, a brake-disk, an interposed driven pulley, a slidable shaft fixedly connected to said driven pulley, a rock-shaft, means for actuating the same, and means interposed between said rock-shaft and the ends of said slidable shaft for positively shifting the latter and its pulley toward either the driving pulley or the brake-disk.

17. In a power transmitter, drivin and driven pulleys, one of said pulleys eing shiftable into and out of frictional engagement with the other, oppositely inclined cams arranged on opposite sides of the shiftable pulley and simultaneously reciprocable transversely to the axis thereof, means for constantly maintaining said cams in operative relation to said shiftable pulley, and means for actuating said cams.

18. In a' power-transmitter, relatively shiftable driving and driven pulleys,' an oscillatory shift member having arms extending therefrom, thrust members each moved by a respective arm for effecting the relative shifting of said pulleys, and means for actuating said shift member.

19. In ,a power transmitter, relatively shiftable driving and driven members, oppositely disposed s aced thrust members for effecting said shi ting, and means for reciprocally actuating said thrust members.

In testimony whereof, I have signed my name to this specification.

ALBERT H. DE VOE. 

